I was reset the samsung ml-1666 by using of chiprest utillity but printer is (asking )change ml-1640 insted of ml1666 what i do plz help me

SOURCE: how can i do 0 for ml-1640 page count ,and want to resetpagecount

You have to flash the printer with the fixed firmware and it will never ask you again for a new toner cartridge :) it is a 1 minute job for me and i charge my Local customers 10 Euro mostly because it has to be done just once and then you just refill the cartridge without doing anything else ( this is just an explanation - i don't want your money)

SOURCE: Driver for Samsung ML-1640 for WIN98SE

I got the same problem. It seems they did not develop specific drivers for win98se. However, I found that you can print using the drivers for the old Samsung ML-2510. Win98se drivers for that printer can still be downloaded from Samsung website. I've been using the 2510 drivers with the 1640 printer for a couple of months, and worked fine so far. It seems very little change in electronics from the 2510 to the 1640 model.
You need also Virtual Printer Port for USB from microsoft.

SOURCE: Samsung ml 1640 chip reset

Try http://www.refillbros.com/diskusije/viewtopic.php?f=3&t=469

SOURCE: how to reset samsung ml 1640 counter

You can reset your printer using reset software and use refill toner forver. www.nakshatraworld.com

SOURCE: My samsung ml 1640 printer does not work properly

This printer needs a chip on the side of the cartridge. Unfortunately the starter cartridge doesn't have a cip nor a place for it. You need to buy a new cartridge and change the cip when you refill it!